Steam or hot water boiler



Jan. 7, 1936. J. W. LOCKETT 2,027,345

STEAM OR HOT WATER BOILER Filed Dec. 2l, 1933 5 Sheets-Sheet 1 WATER l INVENTORS 9C 23 fio. ,ZZ

Q BY .JUHA/ W. vf/rg?? ATTORNEYS Jan. 7, 1936. 1w. LOCKETT 2,027,345

STEAM OR HOT WATER BOILER Filed Deo. 2l, 1935 3 Sheets-Sheet 2 Jan. 7, 1936. J. w. n ocKl-:TT 2,027,345

STEAM OR HOT WATER BOILER Filed Deo. 2l, 1933 3 Shets-Sheet 3 .INVENTORS 19 1 BY Joy/v mmc/(Err Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE STEAM R HOT WATER BOILER Application December 21, 1933, Serial No. '103,356

11 Claims.

The present invention relates to boilers and has for an object to make improved provision for heating water for a separate supply as, for example, for household uses.

The invention aims to provide an arrangement whereby an auxiliary water supply unit mounted in the boiler below the water line is surrounded by the hottest water in the boiler and further to provide means for automatically increasing the lire if and when a considerable amount of cold water is drawn through the heating unit. To this end the invention provides means whereby the current of water induced in the boiler by the heating of the boiler water flows from.

l5 a region of maximum heating directly to and' about the auxiliary water heating unit and further provides a thermostat connected for automatically increasing the iire when the boiler water about the water heater is cooled below a predetermined temperature by cold water owing through the water heater.

In order that the thermostat may respond promptly to changes in the temperature at the heating unit, it is arranged to be acted upon by a current of water flowing past the Water heater uni The invention has been developed more particularly in connection with the construction of a boiler designed more particularly for the use oi an oil burner and for convenience of disclosure such an embodiment of the invention will be more particularly described. lt will be understood, however, that the particular description is illustrative merely and is not intended as delning the limits of the invention.

The nature and' objects of the invention will be better understood from the following description of the selected embodiment for the purposes of which description reference should be had to 40 the accompanying drawings forming a part hereof and in which- Figure 1 is a vertical sectional view taken longitudinally through a iire tube boiler embodying the invention,

Fig. 2 is a sectional plan view showing the position of the heating unit in the boiler, taken on the line 2-2 of Fig. l,

Fig. 3 is a detail view of an instantaneous water heating unit,

50 Fig. 4 is a sectional view taken on the line 4-4 of Fig. 3, 4 Fig. 5 is a sectional view taken on the line 5-5 of Fig. 3,

Fig. 6 is a sectional view through the thermo-i 55 stat chamber taken on the line 6--6 of Fig. 2,

Fig. 'l is a sectional view taken on the line l-l of Fig. o,

Fig. 8 is a detail view or a tank heater unit,

Fig. 9 is a sectional view taken on the line 9--9 oi Fig. 8, 5 In the embodiment shown for the purposes of illustration, the boiler having a combustion chamber 5 with an oil burner 6, a water chamber l and rire tubes. t is equipped with a water heating unit i0 which may be either an instanl0 taneous heating unit as shown in detail in Figs.

3 and 4 or a tank heating unit as shown in Figs.

8 and 9 connected to a water supply tank to maintain hot water therein. At the front of the boiler a steel or iron box opening il is Welded l5 securely or otherwise fitted to the boiler shell and provides an opening into the boiler to receive the water heating unit lil and a flange i2 to which the heating unit is secured. At the rear oi' the boiler a bracket it supports the rear end of the heating unit.

The instantaneous heating unit is shown as consisting of a number of parallel tubes i4 arranged in two planes and preferably so connected that the water flows through all of the tubes in series. All of the tubes are connected to the single header at the front of the furnace but at the opposite ends they are connected separately in pairs to permit differential expansion. The header of the water heater has a flange lb which Ilts against and is readily bolted to the flange it or the member ii. lThe inlet and outlet i6 and lll may be turned to the right or left depending upon whether the water supply is more convenient to the one'side or the other of the boiler.

The tank heating unit is constructed to be secured alternatively into the same position as the instantaneous heater unit. As shown in Figs. 8 and 9, it is in general similar to the instantaneous unit and comprises a header i9 and tubes :it but several tubes are connected in parallel as indicated in Fig. 9. The flange 2i of the header is similar to the flange i5 and has similar bolt holes. 45

The heating unit of either type is positioned preferably horizontally above the crown sheet 22 but below the water line. Deiiector plates 23 and 2t are positioned in the boiler and extend toward the heating unit in a position to cause the current of Water induced by the heat transmitted from the combustion chamber at the sides and along the crown sheet to the adjacent boiler water to be directed against the tubes of the water heater. Obviously when the combus- Y the freshly heated water is directed to the heating' unit.

It is a feature of the invention that a thermostat is so arranged within the boiler that if the water about the heating unit becomes chilled by a considerable flow of cold water through the heating unit the thermostat will cause the rire to be increased. As shown a thermostat 25 within the boiler is arranged to be acted upon by a current of water ilowing from around the tubes of the heating unit to and around said thermostat. The thermostat may be positioned in a chamber into which a current of the boiler water i'rom around the tubes is caused to ow. Such a chamber is formed in the boiler shown by providing an auxiliary trough-shaped deflector member 26 beneath one of the substantially horizontal main deiiector plates 23, 24. The edges of the trough are spaced about half an inch from the plate to form slots 21, 28, lugs 29, 30 being provided at the inner end to bear against, and provide a point of attachment to, the plate 24. Obviously this arrangement may be varied.

It has been found in practice that a satisfactory ow of the boiler water from about the heater unit into the thermostat chamber is induced in an arrangement such as shown in the drawings and above described. Probably the ow of the heat induced current of water against the trough-shaped deilector creates a slight suction at the slots 21, 28. Probably also the current inwardly between the crown sheet and the deflector plate 23 on the opposite side assists in causing a flow into the thermostat chamber since at this particular point this ow is not opposed by the ilow of water from between the crown sheet and the deflector plate 23 on the opposite side assists in causing a flow into the thermostat chamber since at this particular point this ow is not opposed by the ilow of water from between the crown sheet and the plate 24. Probably also the cold water about the heater tubes when water is drawn in substantial quantity tends to ilow down onto and along the trough into the thermostat chamber. An operative connection between the thermostat and the oil burner control, whether a valve, electric motor or other responsive device is provided whereby upon cooling of the thermostat by a flow of cold water from about the water heating unit the oil burner control will be correspondingly actuated and when the thermostat is again heated above the critical point the control will be released to permit shutting oilr of the burner if the control is not at that time held in actuated position under control of another'thermostat or by other means.

Ordinarily it will not be necessary to provide a second thermostat within the boiler whether above or below the water line to insure the maintenance of a predetermined temperature at another part of the boiler although obviously certain advantages for special installations might be gained thereby.

The capacity of the boiler as such and OI the water heating unit may be so related that the full capacity is required by the water heater when a considerable amount of water is being drawn.l In practice this will not be objectionable for in installations of the type for which such boilers and heating units are designed there will be relatively little occasion for continuously drawing water for long periods, furthermore there is the advantage that the drawing of water will not cause an undesired making of steam with resultant delivery of undesired heat.

A small opening 30 may be provided at the outer edge of each of the deflector plates 23, 24 against the boiler shell to prevent pocketing of water above the plates when draining the boiler or pocketing'oi steam beneath the plates in use and a similar opening 3i may be provided in the trough 26. Possibly the opening 3i plays a part in the circulation of water through the trough It is to be noted that in operation due to the fact that the thermostat is not too close to the water heating unit the drawing of a small amount of water through the heating unit will not cause the oil burner to be actuated. 'I'he moderate time lag between the drawing of water and actuation of the thermostat is obviously of substantial advantage for this reason but the lag is not suiiicient to provide unsatisfactory operation when a considerable quantity of water is drawn.

'I'he boiler shown may be used with entire satisfaction and economically for maintaining a supply of hot water for household purposes even insummer when no heat is desired in the house.

I claim:

1. A boiler having a combustion chamber and a water chamber thereabove with a horizontal crown sheet between said chambers, a water heating unit having water tubes extending horizontally above said crown sheet, and deflector plates extending generally parallel to said crown sheet toward said water tubes to direct a current of water heated by the crown sheet to the space around said water tubes.

2. In a boiler the combination with a water heating unit projecting into the boiler below the water line of a thermostat also projecting into the boiler below the water line and means for directing a flow of water from around the water heating unit; to the thermostat whereby the thermostat is responsive to changes to temperatures in the water immediately around the water heating unit.

3. A boiler having a combustion chamber and a water chamber with a crown sheet therebetweeny a Water heating unit having tubes extending parallel to said crown sheet and a deector plate arranged to guide a current of water along said crown sheet to said water heating tubes, a thermostat and means for'directing a ilow of water from around the water heating tubes to the thermostat.

4. A boiler having a combustion chamber and a water chamber thereabove with a horizontal crown sheet between said chambers, a water heating unit having water tubes extending horizontally above said crown sheet, deflector plates extending generally parallel to said crown sheet toward said water tubes to direct a current of water heated by the crown sheet to the space around said water tubes, a thermostat and means for directing a current of water from the space around the water tubes to the space around the thermostat.

5. A boiler having a combustion chamber and liti a water chamber surrounding the combustion chamber at the tcp and sides thereof, a water heating unit having a series of tubes extending above said combustion chamber within the 'water chamber, means for directing a current of water from adjacent the walls between the combustion chamber and water chamber into contact with the water heating tubes, a thermostat and means for directing a current oi water from around the water heating tubes into contact with the thermostat.

6. A boiler having a combustion chamber and a water chamber surrounding the combustion chamber at the top and sides thereof, a water heating unit having a series ot tubes extending above said combustion chamber within the water chamber, deiiector plates arranged to term a thermostat chamber and means ior directing a flow ci water from contact with the water tubes to said thermostat chamber and a thermostat in said thermostat chamber.

'i'. lin a boiler the combination with a water heating unit projecting into the boiler below the water line, of a main deilector plate arranged to direct a current oi hot water against the water heating unit, and a trough-shaped auxiliary dehector member positioned beneath and adjacent the main deilector plate to provide thereagainst a thermostat receiving chamber extending toward the water heating unit, the edges ci the de hector member being spaced slightly ir the main defiector plate.

it boiler having a combustion chamber and a water chamber with a crown sheet therebetween, a tubular water heater extending hori-a zontally and centrally above the crown sheet, a pair oi delector plates extending trom the sides of the boiler toward the heater unit and generally parallel to the crown sheet to guide a current ci water toward the heater unit, and an auxiliary deflector member extending beneath one delector plate and toward the heating unit to provide a thermostat chamber between said auniliary derlector member and the deflector plate, the edge of said auxiliary defiector member being spaced slightly from the main deector plate.

9. A boiler having a crown sheet, a heating unit removably mounted in the boiler above and sub stantially parallel to the crown sheet, and a dehector plate extending generally horizontally above the crown sheet arranged to direct a current or hot water against the heating unit, the boiler being formed with a flanged opening to receive the heating unit and the heating unit having a header formed with a ange htting the ange of the boiler opening, substantially as described.

lii. In a boiler having a combustion chamber and a water chamber the combination with a water heating unit extending horizontally into the water chamber below the water line of a deector plate extending in a generally horizontal direction arranged to deect a rising current of water against the water heating unit.

ll. A boiler having a combustion chamber and a water chamber thereabove with a horizontal crown sheet between said chambers, a water heating unit having water tubes extending horizontally above said crown sheet, and a generally horizontal deiiector plate extending across a major portion of the boiler arranged to direct a current of hot water against the water heating unit. 

